OCR S1 2012 January — Question 1

Exam BoardOCR
ModuleS1 (Statistics 1)
Year2012
SessionJanuary
TopicDiscrete Probability Distributions
TypeOne unknown from sum constraint only
1 The probability distribution of a random variable \(X\) is shown in the table.
\(x\)1234
\(\mathrm { P } ( X = x )\)0.10.3\(2 p\)\(p\)
  1. Find \(p\).
  2. Find \(\mathrm { E } ( X )\).
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